CN102642966A - Cooling crystallization desalting system for high-salinity waste water - Google Patents
Cooling crystallization desalting system for high-salinity waste water Download PDFInfo
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- CN102642966A CN102642966A CN2012101201403A CN201210120140A CN102642966A CN 102642966 A CN102642966 A CN 102642966A CN 2012101201403 A CN2012101201403 A CN 2012101201403A CN 201210120140 A CN201210120140 A CN 201210120140A CN 102642966 A CN102642966 A CN 102642966A
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Abstract
The invention discloses a cooling crystallization desalting system for high-salinity waste water, which is characterized in that the system comprises a waste water storage groove for holding waste water. An outlet of the waste water storage groove is connected with a pipe-side inlet of a waste water heat exchanger; a pipe-side outlet of the waste water heat exchanger is connected with an inlet at the lower part of a cooling crystallizer; the cooling crystallizer is provided with two outlets, that is, the upper outlet of the cooling crystallizer outputs a mother solution to a comprehensive wastewater pool, and the bottom outlet of the cooling crystallizer outputs crystal mush to a centrifugal machine; an upper outlet of the centrifugal machine outputs filtering liquid to the comprehensive wastewater pool, and a bottom outlet of the centrifugal machine outputs filtering residues to a salt recovery pool; a shell-side inlet of the waste water heat exchanger is connected with an external pipe outlet of a liquid-oxygen heat exchanger; an external pipe inlet of the liquid-oxygen heat exchanger is connected with an outlet of a glycol solution storage tank; an inlet of the glycol solution storage tank is connected with a shell-side outlet of the waste water heat exchanger; liquid oxygen is aerated to an internal pipe inlet of the liquid-oxygen heat exchanger; and an internal pipe outlet of the liquid-oxygen heat exchanger is connected with a supercritical water oxidization system.
Description
Technical field
The present invention relates to wastewater processing technology; Be particularly related to a kind of that combine with supercritical water oxidation, (the waste water crystallisation by cooling desalination system of saltiness＞3.5wt%), especially those contain that solubility with temperature descends and the processing of inorganic salt (like the sodium sulfate) waste water that significantly descends as saliferous low-temperature receiver, high to utilize liquid oxygen.
Background technology
Processing industries such as chemical industries such as petrochemical complex, agricultural chemicals, pharmacy and dyestuff and meat, sea-food can be discharged the organic waste water of a large amount of high saliferous, high density, bio-refractory in process of production.Practice shows; Need when conventional biologic treating technique is handled high slat-containing wastewater such waste water is diluted, the salts contg of intaking is controlled at below 1%, but will realizes above-mentioned purpose; Can cause the significant wastage of water resources; Treatment facility is huge, thereby causes the investment of system to increase, and running cost increases.
Mainly be to adopt the multiple-effect evaporation desalination to the desalting treatment device of high slat-containing wastewater in the market, and the multiple-effect evaporation labor energy not only, and composition is complicated in the waste water, and vaporizer often faces serious corrosion and scale problems.Waste water after the evaporation concentration need cool off back entering mold on the other hand, carries out separating of magma and mother liquor.It is energy that the cooling of waste water equally also will consume cold energy.Be necessary to develop a kind of desalination system of high slat-containing wastewater for this reason, make it effectively to deviate from the saltiness of waste water, significantly reduce the consumption of energy simultaneously.
Supercritical water oxidation technology (Supercritical Water Oxidation is called for short SCWO) is a kind of novel treatment technology that receives the organic waste/waste water of extensive concern in recent years.Used oxygenant has liquid oxygen, oxygen, air, hydrogen peroxide etc. in the supercritical water oxidation, and wherein liquid oxygen need be preheated to comparatively high temps before getting into reactor drum.When utilizing supercritical water oxidation technical finesse highly salt containing organic waste water ,-183 ℃ low temperature liquid oxygen is a kind of cold energy source that well can supply utilize.Utilize the cold energy of liquid oxygen, cool off high slat-containing wastewater, can realize the purpose of the preparatory desalination of waste water.Because high slat-containing wastewater water quality difference, big ups and downs can take place in the amount of the liquid oxygen that supercritical water oxidation technical finesse high slat-containing wastewater technology is provided, if use liquid oxygen as low-temperature receiver merely, the crystallisation by cooling system of high slat-containing wastewater just is difficult to the steady and continuous operation.
Summary of the invention
The object of the present invention is to provide a kind of liquid oxygen that utilizes as low-temperature receiver; Through cooling the inorganic salt crystallization in the waste water is separated out; Realize the novel process of waste water desalination again through spinning; Can effectively solve the existing high energy consumption problem of desalinating process when multiple-effect evaporation of high slat-containing wastewater, and to problems such as corrosion on Equipment and foulings.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of crystallisation by cooling desalination system of high slat-containing wastewater; It is characterized in that; Comprise the waste water storage tank of admitting waste water, the outlet of this waste water storage tank connects the pipe side entrance of wastewater heat exchange device, and the pipe side outlet of wastewater heat exchange device connects the inlet of cooling crystallizer bottom; The outlet of cooling crystallizer has two, and top outlet output mother liquor is to the comprehensive wastewater pond; Outlet at bottom output magma is to whizzer, and the outlet output of the top of whizzer is filtrated to the comprehensive wastewater pond, the outlet at bottom of whizzer output filter residue to salt pond for recovering; The shell-side inlet of said wastewater heat exchange device connects the outer tube outlet of liquid oxygen interchanger; The outer tube inlet of liquid oxygen interchanger connects the outlet of ethylene glycol solution storage tank; The inlet of ethylene glycol solution storage tank connects the shell-side outlet of wastewater heat exchange device; The interior tube inlet of liquid oxygen interchanger feeds liquid oxygen, and the interior pipe outlet of liquid oxygen interchanger connects supercritical water oxidation system.
In the such scheme; Increase freezing unit interchanger between said wastewater heat exchange device and the cooling crystallizer; The pipe side entrance of this freezing unit interchanger connects the pipe side outlet of wastewater heat exchange device; The pipe side outlet of freezing unit interchanger connects the inlet of cooling crystallizer bottom, and the shell-side of freezing unit interchanger is connected with freezing unit.
Said waste water storage tank inside is provided with spiral coil cooling tube, and the inlet of spiral coil cooling tube is connected with the liquid inlet of cooling tower through a recycle pump, and the outlet of spiral coil cooling tube is connected with the liquid exit of cooling tower.
Compared with prior art, advantage of the present invention is:
1, combine with the supercritical water oxidation technology of high concentrated organic wastewater, effectively utilize the cold energy of liquid oxygen in the supercritical water oxidation technology, the temperature of high slat-containing wastewater is significantly descended, the inorganic salt crystallization in the waste water is separated out, and has improved the utilising efficiency of energy.The high slat-containing wastewater temperature descends simultaneously, has reduced corrosion on Equipment;
2, utilize ethylene glycol solution as middle heat transferring medium.Temperature descended after ethylene glycol solution at first carried out heat exchange with liquid oxygen, and the ethylene glycol solution that temperature descends carries out heat exchange with high slat-containing wastewater again, the cooling high slat-containing wastewater.When this had effectively been avoided liquid oxygen and high slat-containing wastewater direct heat exchange, heat transfer temperature difference excessive (＞10 ℃) caused heat exchanger surface to form brilliant scar, had solved the problem that heat exchange worsens, and system's continous-stable operation guarantees to know clearly.
3, can increase freezing unit and freezing unit interchanger.The influence that changed by waste water quality, the total amount of the liquid oxygen that supercritical water oxidation system is required often changes, thereby causes the fluctuation of waste water cooling temperature.For avoiding above-mentioned situation occurring, increase freezing unit and freezing unit interchanger, through regulating the power of freezing unit, the final cooling temperature of control high slat-containing wastewater guarantees that the waste water cooling temperature is stable, the crystallisation by cooling desalinating process moves continuously.
4, at waste water storage tank set inside spiral coil cooling tube, feed recirculated cooling water, high slat-containing wastewater is cooled to normal temperature;
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description.
Fig. 1 is a process flow diagram of the present invention.
Among the figure: 1 is the waste water storage tank; 2 is cooling tower; 3 is the wastewater heat exchange device; 4 is the liquid oxygen interchanger; 5 is cooling crystallizer; 6 is the comprehensive wastewater pond; 7 is whizzer; 8 is the salt pond for recovering; 9 is the ethylene glycol solution storage tank; 10 is liquid oxygen storage tank; 11 is freezing unit interchanger; 12 is freezing unit; 13 is water coolant; 14 is magma; 15 is mother liquor; 16 are filtrating; 17 is filter residue; P1 is a cooling water circulating pump; P2 is a waste water pump; P3 is the magma pump; P4 is the ethylene glycol solution pump; P5 is a liquid oxygen pump.
Embodiment
With reference to Fig. 1; High slat-containing wastewater is stored in the waste water storage tank 1; The outlet of waste water storage tank 1 connects waste water pump P2; The waste water pump outlet is connected with the inlet of wastewater heat exchange device 3 pipe sides, and the outlet of wastewater heat exchange device 3 pipe sides is connected with the inlet of freezing unit interchanger 11 pipe sides, and the outlet of freezing unit interchanger 11 pipe sides is connected with the inlet of cooling crystallizer 5.The shell-side outlet of freezing unit interchanger 11 is connected with the entrance and exit of freezing unit 12 respectively with inlet.The mother liquor outlet on cooling crystallizer 5 tops is connected with the inlet in comprehensive wastewater pond 6; The magma outlet of cooling crystallizer 5 bottoms is connected with the inlet of whizzer 7; The filtrate outlet of whizzer 7 is connected with another inlet in comprehensive wastewater pond 6, and the sludge outlet of whizzer 7 is connected with the inlet in storage salt pond 8.
Liquid oxygen is stored in the liquid oxygen storage tank 10, and the outlet of liquid oxygen storage tank 10 is connected with the inlet of liquid oxygen pump P5, and the outlet of liquid oxygen pump P5 is connected with the interior tube inlet of liquid oxygen interchanger 4, and the interior pipe outlet of liquid oxygen interchanger connects supercritical water oxidation system.
Ethylene glycol solution is stored in the ethylene glycol solution storage tank 9; The outlet of ethylene glycol solution storage tank 9 is connected with the inlet of eg pump P4; The outlet of eg pump P4 is connected with the outer tube inlet of liquid oxygen interchanger 4; The outer tube outlet of liquid oxygen interchanger 4 is connected with the shell-side inlet of wastewater heat exchange device 3, and the shell-side outlet of wastewater heat exchange device 3 is connected with the inlet of ethylene glycol solution storage tank 9.
The set inside of waste water storage tank has spiral coil cooling tube, and the inlet of spiral coil cooling tube connects cooling water circulating pump P1, and the outlet of spiral coil cooling tube is connected with the liquid inlet section of cooling tower 2, and the liquid exit of cooling tower 2 is connected with the inlet of cooling water circulating pump P1.
The technological principle of system of the present invention is:
(1) contains a large amount of inorganic salt (the main sodium sulfate of inorganic salt in the present embodiment, saltiness is near 29wt% under the normal temperature condition) in the waste water.Above-mentioned high-salt wastewater is stored in the waste water storage tank 1, is delivered to wastewater heat exchange device 3, freezing unit interchanger 11 heat exchange cooling through waste water pump P2.
(2) highly salt containing organic waste water reduces through cooling crystallizer 5 cooling temperatures, and the unsaturated solution of salt becomes supersaturated solution gradually again, and this moment, inorganic salt were separated out.Crystallisation by cooling is particularly useful for the reduction of solubility with temperature and the system that significantly descends, and sodium sulfate just is like this in the present embodiment.
(3) consume a large amount of liquid oxygen in the supercritical water oxidation system, the liquid oxygen temperature is-183 ℃.Cool off highly salt containing organic waste water with liquid oxygen, utilize the cold energy of liquid oxygen to make the salifiable supersaturated solution of wastewater temperature decline shape, inorganic salt are separated out gradually and are separated through whizzer 7.
(4) for avoiding the too high interchanger face that causes of local degree of supersaturation to form brilliant scar, utilize ethylene glycol solution in the present embodiment, avoided liquid oxygen and high slat-containing wastewater direct heat exchange as secondary refrigerant.
Claims (3)
1. the crystallisation by cooling desalination system of a high slat-containing wastewater; It is characterized in that; Comprise the waste water storage tank of admitting waste water, the outlet of this waste water storage tank connects the pipe side entrance of wastewater heat exchange device, and the pipe side outlet of wastewater heat exchange device connects the inlet of cooling crystallizer bottom; The outlet of cooling crystallizer has two, and top outlet output mother liquor is to the comprehensive wastewater pond; Outlet at bottom output magma is to whizzer, and the outlet output of the top of whizzer is filtrated to the comprehensive wastewater pond, the outlet at bottom of whizzer output filter residue to salt pond for recovering; The shell-side inlet of said wastewater heat exchange device connects the outer tube outlet of liquid oxygen interchanger; The outer tube inlet of liquid oxygen interchanger connects the outlet of ethylene glycol solution storage tank; The inlet of ethylene glycol solution storage tank connects the shell-side outlet of wastewater heat exchange device; The interior tube inlet of liquid oxygen interchanger feeds liquid oxygen, and the interior pipe outlet of liquid oxygen interchanger connects supercritical water oxidation system.
2. the crystallisation by cooling desalination system of high slat-containing wastewater as claimed in claim 1; It is characterized in that; Increase freezing unit interchanger between said wastewater heat exchange device and the cooling crystallizer; The pipe side entrance of this freezing unit interchanger connects the pipe side outlet of wastewater heat exchange device, and the pipe side outlet of freezing unit interchanger connects the inlet of cooling crystallizer bottom, and the shell-side of freezing unit interchanger is connected with freezing unit.
3. according to claim 1 or claim 2 the crystallisation by cooling desalination system of high slat-containing wastewater; It is characterized in that; Said waste water storage tank inside is provided with spiral coil cooling tube; The inlet of spiral coil cooling tube is connected with the liquid inlet of cooling tower through a recycle pump, and the outlet of spiral coil cooling tube is connected with the liquid exit of cooling tower.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925587A (en) * | 2014-04-15 | 2014-07-16 | 太原理工大学 | Coal-fired supercritical hydrothermal burning power generating device |
| CN105366746A (en) * | 2015-11-10 | 2016-03-02 | 唐山宝翔化工产品有限公司 | 2-naphthol wastewater processing technology |
| CN105776397A (en) * | 2016-04-14 | 2016-07-20 | 新奥科技发展有限公司 | Salt-containing wastewater freezing treatment system and method thereof |
| CN106082490A (en) * | 2016-06-29 | 2016-11-09 | 广西大学 | A kind of processing method of offshore platform sewage |
| CN109133474A (en) * | 2018-10-15 | 2019-01-04 | 西安交通大学 | A kind of injection boiler separating at high temperature water recycling processing system and processing method |
| CN110606604A (en) * | 2019-09-30 | 2019-12-24 | 新中天环保股份有限公司 | Cooling crystallization system for salt-containing wastewater |
| CN112121452A (en) * | 2020-09-27 | 2020-12-25 | 江苏科技大学 | Desalination system and desalination method for ethylene glycol barren solution containing high-solubility salt in deep sea natural gas exploitation |
| CN115072915A (en) * | 2021-04-29 | 2022-09-20 | 阮氏化工（常熟）有限公司 | System and method for continuously recovering sodium sulfate in salt-containing wastewater by freezing method |
| CN115448406A (en) * | 2022-09-19 | 2022-12-09 | 江苏中电创新环境科技有限公司 | Separation and purification system and separation and purification method for organic waste liquid |
| CN115521017A (en) * | 2022-10-19 | 2022-12-27 | 泰州金泰环保热电有限公司 | Wastewater desalination and purification system capable of resisting coking, scaling and corrosion |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103925587A (en) * | 2014-04-15 | 2014-07-16 | 太原理工大学 | Coal-fired supercritical hydrothermal burning power generating device |
| CN105366746A (en) * | 2015-11-10 | 2016-03-02 | 唐山宝翔化工产品有限公司 | 2-naphthol wastewater processing technology |
| CN105776397B (en) * | 2016-04-14 | 2019-05-03 | 新奥科技发展有限公司 | Brine waste freezing processing system and method |
| CN105776397A (en) * | 2016-04-14 | 2016-07-20 | 新奥科技发展有限公司 | Salt-containing wastewater freezing treatment system and method thereof |
| CN106082490A (en) * | 2016-06-29 | 2016-11-09 | 广西大学 | A kind of processing method of offshore platform sewage |
| CN106082490B (en) * | 2016-06-29 | 2019-03-29 | 广西大学 | A kind of processing method of offshore platform sewage |
| CN109133474A (en) * | 2018-10-15 | 2019-01-04 | 西安交通大学 | A kind of injection boiler separating at high temperature water recycling processing system and processing method |
| CN110606604A (en) * | 2019-09-30 | 2019-12-24 | 新中天环保股份有限公司 | Cooling crystallization system for salt-containing wastewater |
| CN112121452A (en) * | 2020-09-27 | 2020-12-25 | 江苏科技大学 | Desalination system and desalination method for ethylene glycol barren solution containing high-solubility salt in deep sea natural gas exploitation |
| CN115072915A (en) * | 2021-04-29 | 2022-09-20 | 阮氏化工（常熟）有限公司 | System and method for continuously recovering sodium sulfate in salt-containing wastewater by freezing method |
| CN115448406A (en) * | 2022-09-19 | 2022-12-09 | 江苏中电创新环境科技有限公司 | Separation and purification system and separation and purification method for organic waste liquid |
| CN115448406B (en) * | 2022-09-19 | 2023-08-08 | 江苏中电创新环境科技有限公司 | Separation and purification system and separation and purification method for organic waste liquid |
| CN115521017A (en) * | 2022-10-19 | 2022-12-27 | 泰州金泰环保热电有限公司 | Wastewater desalination and purification system capable of resisting coking, scaling and corrosion |
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| CN102642966B (en) | 2013-07-24 |
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Effective date of registration: 20160720 Address after: 710049 Xianning West Road, Shaanxi, China, No. 28, No. Patentee after: Xi'an Jiaotong University Patentee after: ECOWA ENVIRONMENTAL AND ENERGY TECHNOLOGIES (ZHANGJIAGANG) CO., LTD. Address before: 710049 Xianning West Road, Shaanxi, China, No. 28, No. Patentee before: Xi'an Jiaotong University Patentee before: Suzhou Aikewo Environment Energy Technology Co.,Ltd. |
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